Keelie has a triangular-shaped card. The lengths of its sides are 3.9 cm, 5.2 cm, and 6.5 cm. Is the card a right triangle?

Yes

Step-by-step explanation:

Since the longest side is 6.5 cm, so let it be hypotenuse c.

Verifying by right angle formula

c^2=a^2+b^2

(6.5) ^2 = (3.9) ^2 + (5.2) ^2

42.25=15.21+27.04

42.25=42.25

Hence the given triangle is a right angles triangle